Dempsey revealed the news to Brazilian reporters, and says that he will be playing "a darker character." According to Access Hollywood and Paramount reps, he'll be playing the boss of Mikaela Banes. (I can never remember that character has a real name.) That means most of his scenes will be with Ms. Megan, and the universe might collapse in on itself from the sheer amount of sexy. Pray for us all.
Dempsey is just the latest addition to push the Transformers 3 cast into "Oh my gosh, really?" territory, as John Malkovich and Frances McDormand joined the cast back in March. Either everyone in Hollywood is a secret fan of Optimus Prime or Bumblebee and this is their last chance to get in on the fun, or the script is like pure Shakespeare. They could also need a big paycheck. But come on, how plausible is that?